Thread: Changing a variable to a constant.

Hi,
I have a question about changing a variable to a constant.

My problem arrises using Texas Instruments' CCS3.1
compiler. The following boiled down code builds finely in Microsofts VC6, but not in CCS:

Code:

void main(){
	 const int bufsize = 2;
	 int splitbuf[bufsize]; //line 5.
}

In CCS I get the following error message:

"arrTest.c", line 5: error: expression must have a constant value

Does anyone have a suggestion for a workaround, that will make it possible for me to change a variable into a constant so my program will compile in CCS?

Best regards, Esben.

The const keyword actually means "read only" in C. For true constants, C programmers usually use #define's - constant symbol, or, you could hard-code a constant value into your source code but the former is more used, for good reasons.

Hi xeddiex,
thanks for your reply. I am aware of the #define option. I guess my problem needs a bit more specification:

My code looks more simular to the following:

Code:

#define BUFSIZE(x,y) ((x)+(y))
void main(){
	const int x = 2;
	const int y = 3;
	const int bufsize = BUFSIZE(x, y);   
	int splitbuf[bufsize]; 
}

It will work in VC6 if I remember to declare all the integers as const, but CCS ...buhuu... still sees 'bufsize' as a variable.

Provided this new information, does anyone have an idea how to make my bufsize constant?

Best regards, Esben.

I think you're compiling in C++. Make sure your file extension ends in .c, not .cpp.

DOH! Thanks for the enlightenment.

So now the question is if there is a bug in the original open source c code, that is not noticed by the MSVC... Guess I gotta look into that.

Thanks again!
So long.